// 数字转为大写金额
exports.digitUppercase = (n) => {
  const fraction = ['角', '分'];
  const digit = [
      '零', '壹', '贰', '叁', '肆',
      '伍', '陆', '柒', '捌', '玖'
  ];
  const unit = [
      ['元', '万', '亿'],
      ['', '拾', '佰', '仟']
  ];
  n = Math.abs(n);
  let s = '';
  for (let i = 0; i < fraction.length; i++) {
      s += (digit[Math.floor(n * 10 * Math.pow(10, i)) % 10] + fraction[i]).replace(/零./, '');
  }
  s = s || '整';
  n = Math.floor(n);
  for (let i = 0; i < unit[0].length && n > 0; i++) {
      let p = '';
      for (let j = 0; j < unit[1].length && n > 0; j++) {
          p = digit[n % 10] + unit[1][j] + p;
          n = Math.floor(n / 10);
      }
      s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
  }
  return s.replace(/(零.)*零元/, '元')
      .replace(/(零.)+/g, '零')
      .replace(/^整$/, '零元整');
};
